Burglar-alarm.



No. 862,667. I PATENTED AUG. 6, 1607. B. SEE.

BURGLAR ALARM. 4 APPLICATION FILED FEB. 15' 1905.

WITNESSES 6 /6, i kwkl waw THE NORRIS PETERS co., WASHINGTON, D. c.

BYRON SEE, OF DETROIT, MICHIGAN.

BURGLAR-ALARM.

Specification of Letters Patent.

Patented Aug. 6, 1907.

Application filed February 15, 1906. Serial No. 301,287.

To all whom it may concern:

Be it known that I, BYRON Sun, a citizen of the United States, residingat Detroit, county of Wayne, State of Michigan, have invented a certainnew and useful Improvement in BurglarAlarms, and declare the followingto be a full, clear, and exact description of the same, such as willenable others skilled in the art to which it pertains to make and usethe same, reference being had to the accompanying drawings, which form apart of this specification.

This invention relates to burglar alarms; it has for its object animproved spring actuated bell and mechanism for temporarily stopping theaction of the bell and for releasing the stop mechanism and allowing thebell to be actuated upon the opening of a door or a window to which thealarm may be fixed.

In the drawings:Figure 1, shows the device in place on a door. Fig. 2,is a plan View with the gong of the bell removed, and the hammersremoved. Fig. 3, shows the post. Fig. 4, shows the lever.

1, indicates a base plate adapted to be secured to the stile of a door;upon this is mounted at one end a bell 2 and a case 3 containing thespring by which the bell hammer is actuated and the chain of gearingbetween the spring and the bell hammer.

4, indicates a friction brake applied to the shaft of the spring andthis brake when in frictional engagement with the shaft of the spring,holds it 01' stops it from actuating the bell hammer. The brake is in aform of a bell crank lever mounted on pin 5 and is released by pushingthe end 6 of the lever. When not under pressure from the end 6 the brakeis held against the teeth of the wheel 23, which is fixed to the shaft25, by the pull of the spring 26.

In order that the end (i of the lever may be properly actuated, thereare on the base 1 a pair of posts 7 and 8; of these, the post 7 isprovided with a hole through which a push rod 9 engages; the post 8 isprovided with a slot through which the push rod 9 engages. The push rod9 engaging through the hole in the post 7 and through the slot in thepost 8 is surrounded by a spiral spring 10 which engages between thepost 8 and a pin 11 against which the spring abuts; the spring by itstension tends to push the rod 9 against the end (3 of the bell cranklever 4 and to release the hammer actuatihg mechanism. The exact type ofhammer is not material, that shown herein comprising a lever 24 mountedat its center on the top of the shaft 25, being adapted to rotate withit; on its ends are loosely pivoted loose hammer pieces 24 which strike,as they pass, against projecting portions of the inner or concavesurface of the bell.

On the end of the base 1 are posts 12 and 13 which support the pivot 14upon which swings a lever 15 that extends into the opening between thedoor 16 and the jam 17. The pivot 14 is located entirely forward fromthe edge 18 of the door and the posts 12 and 13 which support it arealso entirely forward from the edge of the door. The lever 15 above thepivot 14 bends forward and upward and this end of the lever is providedwith a slot 19 in which engages the end of the push rod 9; the push rod9 is held in place by a pin 20. This end of the push rod 9 and the endof the lever 15 with which the push rod 9 engages, are both capable ofmovement toward the door and permit the door 16 to swing on its hingesto a nearly open position or until the bell 2 engages against the easingor the wall, nevertheless, the

lever extends far enough to afford the requisite movement.

Upon closing the door, the door and easing together force the end 15toward the edge face of the door 16 and draw the push rod-9 out ofengagement with the bell crank lever, and the bell crank lever 4 nowengages as a brake against the shaft of the spring and prevents thespring although wound, from ringing the bell. As soon as the door isopened, to release the lever 15 even to a slight degree, the spring 11is brought into action and the brake is drawn away from its contactposition with the shaft and the bell sounds an alarm.

When the actuating spring within the case 3 is being wound up and placedunder tension, the gain in tension made at each turn or fraction thereofis,held from loss by backslipping by the engagement of the point of thepawl 20 in the teeth of the wheel 22 which is fixed to the shaft; thepawl 20 is resiliently pressed thereagainst by the leaf spring 21,

What I claim is 2- 1. In an alarm. the combination of a bell hammer, :1brake lever therefor, a push rod engaging the brake lever. and :1 springactuating the push rod, and :1 lever having a bent arm adapted to engagebetween the door and easing, substantially as described. 7

2. In a bell alarm, in combination with a bell and brake for the hammeractuating mechanism. a push rod mounted in a slotted post and engagingthrough :1 slot in a lever pivoted to oscillate between the door andcasing, said oscillating lever being provided with :1 slot through\ahich the push rod engages, substantially as ind for the purposedescribed.

In testimony whereof, I, sign this specification in the presence of twowitnesses.

BYRON SEE.

Witnesses CHARLES F. BURTON, Mini E. KoTT.

